Re: [9fans] Fossil fs recovery

[David Leimbach <leimy2k@gmail.com>]

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Is it obvious enough from the man pages that this wouldn't be too useful to
have on the Plan 9 wiki?

I'm a big believer in the wiki, but not when it pushes one to avoid reading
the authoritative documentation of the man pages.

Dave

On Thu, Aug 11, 2011 at 1:11 AM, David du Colombier <0intro@gmail.com>wrote:

> In fact, it's pretty straightforward.
>
> In the following example, I consider you have a disk sdE0
> with Fossil, and you want to add a disk sdE1 with Venti.
>
> Create the Venti partitions:
>
> disk/fdisk -baw /dev/sdE1/data
> disk/prep -bw -a^(isect arenas bloom) /dev/sdE1/plan9
>
> Format the Venti file systems:
>
> venti/fmtisect isect /dev/sdE1/isect
> venti/fmtarenas arenas /dev/sdE1/arenas
> venti/fmtbloom /dev/sdE1/bloom
>
> Since the bloom filter requires memory equal to its size
> on disk, you could need to pass the parameter -s to fmtbloom
> to specify its size or directly adjust the partition size.
> Keep in mind that Venti use 20% total memory by default, and
> 1/3 of it is allocated to the bloom filter.
> For example, with 1 GB of memory, you cannot have a bloom filter
> larger than 64 MB (which is sufficient) with the default settings.
> Of course, the bloom filter is optional anyway.
>
> Configure Venti:
>
> echo 'index main
> isect /dev/sdE1/isect
> arenas /dev/sdE1/arenas
> bloom /dev/sdE1/bloom' | venti/conf -w /dev/sdE1/arenas
>
> Initialize the index sections:
>
> venti/fmtindex /dev/sdE1/arenas
>
> Read your current Fossil configuration:
>
> fossil/conf /dev/sdE0/fossil > fossil.conf
>
> Edit fossil.conf, it should look like something like:
>
> fsys main config /dev/sdE0/fossil
> fsys main open -V -c 3000
>
> Remove -V to open and srv if needed, then
> add the following line to enable automatic
> snapshots:
>
> fsys main snaptime -s 60 -a 0530 -t 2880
>
> (snapshot at 05:30, temporary snapshot each
>  hour and discarded after two days)
>
> Write your new Fossil configuration:
>
> fossil/conf -w /dev/sdE0/fossil < fossil.conf
>
> Mount your 9fat file system, then add the following line
> to the file /n/9fat/plan9.ini:
>
> venti=#S/sdE1/arenas
>
> After rebooting, the current Fossil content will be dumped
> to Venti.
>
> --
> David du Colombier
>
>

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